it is a crystal. a crystal has actually more than one flat surface. I dont really know how to explain andled sides but it kid of makes it look like an ice cream cone with a point at both the top and the bottom. the "cone" is actually several flat surfaces making it look roundish.
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A Right-angled Trapezium
A right-angled triangle can have equal sides, but does not have to. A right-angled triangle with two equal sides CANNOT be an equilateral triangle. A right-angled triangle cannot be an equilateral triangle.Divide a square along the diagonal, and you are left with two right-angled triangles with two sides of equal length.
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The following shape has three sides and the only angles are right angles. ----- | |___
A Rhomb